Blue Tongue Skink Diet: What to Feed, What to Skip, and How Much
I've kept blue tongue skinks long enough to know that diet is where most owners either set their animal up to thrive or quietly start it down the road to obesity and metabolic bone disease. These are opportunistic omnivores, not specialists, which means the goal isn't a perfect single meal but a varied rotation that lands in the right place over a week. Here's exactly how I feed mine, the foods I never offer, and the supplement routine that keeps their bones solid.
The ratio that actually works
The number worth memorizing is roughly 50% vegetables, 40% protein, 10% fruit by volume for an adult. Juveniles skew more toward protein because they're growing fast, but everyone gets a mix.
That ratio isn't sacred to the gram. What matters more is variety across the week. In the wild a skink eats a beetle one day and fallen fruit the next; it never eats the identical plate twice. I rotate greens, proteins, and the occasional fruit so no single food group, and no single nutrient, dominates.
| Food group | Share of diet | Cadence | Examples |
|---|---|---|---|
| Vegetables (mostly leafy greens) | ~50% | Every meal | Collard, mustard, dandelion greens, squash, zucchini, bell pepper |
| Protein | ~40% | Every meal (smaller portion) | Feeder insects, cooked lean poultry, egg, snails |
| Fruit | ~10% | A couple times a week | Blueberry, mango, papaya, strawberry |
Feeding frequency
- Juveniles: daily, protein-forward.
- Adults: a full meal every other day, or 3 to 4 times a week.
Overfeeding adults is the single most common error I see. Blue tongues pack on fat quickly, and an obese skink is a sick skink waiting to happen.
Vegetables: the foundation
Half the plate is plants, and the workhorses are dark leafy greens. Collard greens, mustard greens, and dandelion greens lead my rotation because they're high in calcium and fiber and low in the oxalates that cause trouble.
Around the greens I add color and texture: butternut and other winter squash, zucchini, bell pepper, green beans, and snap peas. Root vegetables like carrot are fine in moderation for the beta-carotene, but I keep starchy items like potato infrequent.
Skip spinach as a staple. It's nutritious on paper, but its oxalate load binds calcium and blocks absorption. Fed regularly it actively undermines the calcium you're working to supply. I leave it out and lean on the calcium-rich greens instead.
Protein: insects, eggs, and lean meat
Protein is about 40% of the diet, and feeder insects are the backbone. Skinks relish the hunt, and good feeders deliver protein and fat their bodies run on.
My go-to staple feeder is the discoid roach (Blaberus discoidalis). They're soft-bodied enough to digest easily, they don't carry the heavy chitin load that makes mealworms a constant impaction risk, and, crucially for a keeper, discoids can't climb smooth glass or plastic, so escapees stay in the bin instead of colonizing your house. That single trait makes them far less stressful to keep than crickets. I source mine from All Angles Creatures' discoid roach collection and gut-load them on greens before feeding.
A few important corrections to the advice floating around:
- Feeders are not "rich in calcium." Nearly every feeder insect, discoids included, is phosphorus-heavy with a poor calcium-to-phosphorus ratio. You fix that with dusting (see below). The one genuine exception is black soldier fly larvae, which are naturally calcium-rich.
- Mealworms are a treat, not a staple. They're high in chitin and fat, harder to digest, and over-relying on them is a classic route to impaction.
- Discoids are Blaberus discoidalis — a different species from the dubia roach (Blaptica dubia) they're often confused with.
Beyond insects, lean cooked chicken or turkey (unseasoned, no bones) makes an easy protein. Scrambled or boiled egg with no oil or seasoning is a favorite, fed in moderation. In the wild they also take snails and slugs, which are excellent natural calcium sources if you can source them safely (never wild-caught from areas that may be treated with molluscicides). High-quality grain-free wet dog or cat food works as a rare convenience protein, but it's too rich and salty for routine use.
The supplement routine
Because the protein side runs phosphorus-heavy, supplementation isn't optional:
- Plain calcium powder: dust insects at most feedings.
- Calcium with D3: once or twice a week, especially if UVB is minimal.
This is the cheapest insurance against metabolic bone disease you can buy. The Merck Veterinary Manual is blunt about it: inadequate dietary calcium and vitamin D3 are leading causes of metabolic bone disease in captive reptiles (Merck Vet Manual: Metabolic Bone Disease in Reptiles).
Fruit: the 10% treat
Fruit is real food for these skinks but it's sugar-dense, so it stays at about 10%. Mango (high in vitamin A), blueberries, papaya, and strawberry are reliable favorites. Watermelon and cucumber double as hydration on hot days.
Use restraint with high-sugar fruits like grapes and figs, and watch bananas: their calcium-to-phosphorus ratio leans the wrong way (more phosphorus than calcium), so they're an occasional bite, not a regular item. Skip citrus entirely — the acidity irritates their digestive system.
Foods to avoid, no exceptions
Some items are genuinely dangerous. Keep these off the menu:
- Avocado — contains persin, toxic to reptiles.
- Onion, garlic, chives — toxic.
- Rhubarb — toxic.
- Citrus — too acidic.
- Fatty processed meats (bacon, sausage) — salt and additives stress the kidneys.
- Raw meat — parasite and bacteria risk.
- Wild-caught insects — may carry pesticides or pathogens.
- Iceberg lettuce — empty filler, near-zero nutrition.
Hydration
Always provide a shallow, sturdy water dish that can't tip and won't drown a juvenile. Skinks often soak and even defecate in it, so I clean and refill daily. A lot of their water also comes from food, so water-rich produce helps. Signs of dehydration are subtle: wrinkled or loose skin, sunken eyes, flagging appetite. Catch them early, because chronic dehydration stresses the kidneys.
A sample week
Here's how a real rotation looks for one of my adults, fed every other day:
- Day 1: Collard greens + butternut squash, calcium-dusted discoid roaches.
- Day 3: Mustard greens + bell pepper, scrambled egg (no seasoning).
- Day 5: Dandelion greens + zucchini, calcium-dusted discoids, a few blueberries.
- Day 7: Mixed greens + carrot, small piece of cooked turkey, diced mango.
Predictable structure, rotating ingredients, calcium on the insects. That consistency is what keeps a blue tongue plump, bright-eyed, and flashing that blue tongue at feeding time for the fifteen-plus years these animals can live.
For the bigger picture on housing and health, see my Northern blue tongue skink care guide, and for why discoids are my staple feeder, read how to keep discoid roaches alive. More guides live at the exotic animals hub.